Techspot / HUB is reporting that Toshiba is working on a glass based platter that can stack 12 disks inside the drive body that could lead to 40TB by 2027. It will also use Microwave Assisted Magnetic Recording that reduce the magnetic resistance during data writing. So from my understanding of the article, the disk / plate is switched over to glass substrate and have magnetic coating applied on top instead of using aluminum substrate resulting in thinner disks that can cram more in the same drive body.
